Johann christian duntze



any design in transparent colors, by mechanicalm'eans, for although it was found possible I UNITED STATES PATENT OFFICE.

JOHANN oHRIsTIAN DUNTZE, OEFRANKFORT-ON-THE-MAIN, GERMANY.

PROCESS OF PRODUCING COLORS 0N GLASS SURFACES.

SPECIFICATION forming part of Letters Patent No. 503,873, dated November 14,1893.

' Application filed September 29, 1892. Serial No. 447.255. (N0 specimens.)

To all whom it may concern.-

Be it known that I, J OHANN CHRISTIAN DUNTZE, residing at Frankfort-on-the-Main, in'the Kingdom of'Prussia and'German Empire, have invented a new and useful Process of *Producing Colors on Glass Surfaces, of which thefollowing'is a specification.

Notwithstanding numerous efiorts no effective process has hitherto been discovered enabling manufacturers to reproduce on glass,

to apply colors to glass, yet these colors did not attain a sufficient transparency to form a perfeet substitute for stained glass.

The subject of the present invention is a process of reprinting, or' transfer, which willpermit the accomplishment of the aforesaid end in an exceedingly simple and easy man- The design to be reproduced is outlined on the lithographic stone, zinc-plate or the like, in ordin'aryreprinting ink which is then transferredon to the well known transparent transfer-paper,- viz., the so called albuminous paper.

It is necessary in order to carry my invention into efiect to reproduce each of the transparent colors separately upon transfer paper and transfer it upon the glass. The surface of the glass, which may be either fiat or round is first carefully cleaned to remove dust and grease and the transfer sheet bearing the palest of the several colors to be employed in making up the picture, is laid upon the glass. The paper is laid face down upon the glass while yet unmoistened and is pressed against the surface of the glass with a soft brush or :similar tool until it commences to adhere to the glass. The paper is then moistened on the back and again rubbed over with the soft brush or tool. This process should terminate before the paper has given 06 all of its moist-i ing, as the transparent colors will be laid on one over the other producing tints and shades which could not be produced by the application of a single color. This forms a very serviceable imitation of stain glass'and may be used for a variety of purposes, the processbe ing comparatively simple and inexpensive. 7

What I claim,'and desire to secure by Letters Patent, is-.-

sists in printing in transparent colors upon separate transfer sheets, portions of the design, each color being printed upon a separate sheet and transferring said colors successively over one another onto the surface of the glass, substantially as described.

In witness'whereof I have hereunto set my hand in presence of two witnesses.

JOHANN CHRISTIAN DUNTZE. Witnesses:

ALvEs'roS. HOGUE,

JEAN GRUND.

ure and the paper while yet moist ispulled off of the glass leaving the transparent color' the colors are then covered with transparent: varnish to preserve them, and add to their durability. Thepicture or pictures so pro duced will have the appearance of glass paint- The process of ornamentingglass which con- 

